Cheerios are made from oatmeal so yes, they are very high in carbs.
Here is the nutrition facts for 100g of cheerios. As you can see, they are very dense in carbohydrates.
[TABLE="class: _yX, width: 2"]
[TR]
[TD="class: _rhe kno-fb-ctx"]Amount Per 100 grams[/TD]
[/TR]
[TR="class: kno-fb-ctx kno-nf-cq"]
[TD]Calories 371[/TD]
[/TR]
[/TABLE]
[TABLE="class: _yX, width: 2"]
[TR="class: _fDd"]
[TD="class: _VLb, colspan: 2, align: right"]% Daily Value*[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip"]Total Fat 7 g[/TD]
[TD="class: ellip _Igc, align: right"]10%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip _hDd"]Saturated fat 1.4 g[/TD]
[TD="class: ellip _Igc, align: right"]7%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip _hDd"]Polyunsaturated fat 2.4 g[/TD]
[TD="class: ellip _Igc, align: right"][/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip _hDd"]Monounsaturated fat 2.4 g[/TD]
[TD="class: ellip _Igc, align: right"][/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip _hDd"]Trans fat 0 g[/TD]
[TD="class: ellip _Igc, align: right"][/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip"]Cholesterol 0 mg[/TD]
[TD="class: ellip _Igc, align: right"]0%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip"]Sodium 576 mg[/TD]
[TD="class: ellip _Igc, align: right"]24%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip"]Potassium 641 mg[/TD]
[TD="class: ellip _Igc, align: right"]18%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip"]Total Carbohydrate 73 g[/TD]
[TD="class: ellip _Igc, align: right"]24%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip _hDd"]Dietary fiber 9 g[/TD]
[TD="class: ellip _Igc, align: right"]36%[/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip _hDd"]Sugar 4.4 g[/TD]
[TD="class: ellip _Igc, align: right"][/TD]
[/TR]
[TR="class: kno-nf-nr"]
[TD="class: ellip"]Protein 12 g[/TD]
[TD="class: ellip _Igc, align: right"]24%[/TD]
[/TR]
[/TABLE]
If you want something low carb to eat for breakfast, stick with vegetables, eggs, and meat. You could make a big omelette with some vegetables in it.